package com.bowen.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.bowen.common.exception.NoStockException;
import com.bowen.common.to.mq.OrderTo;
import com.bowen.common.to.mq.StockDetailTo;
import com.bowen.common.to.mq.StockLockedTo;
import com.bowen.common.utils.R;
import com.bowen.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.bowen.gulimall.ware.entity.WareOrderTaskEntity;
import com.bowen.gulimall.ware.feign.OrderFeignService;
import com.bowen.gulimall.ware.feign.ProdutFeignService;
import com.bowen.gulimall.ware.service.WareOrderTaskDetailService;
import com.bowen.gulimall.ware.service.WareOrderTaskService;
import com.bowen.gulimall.ware.vo.OrderItemVo;
import com.bowen.gulimall.ware.vo.OrderVo;
import com.bowen.gulimall.ware.vo.SkuHasStockVo;
import com.bowen.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bowen.common.utils.PageUtils;
import com.bowen.common.utils.Query;

import com.bowen.gulimall.ware.dao.WareSkuDao;
import com.bowen.gulimall.ware.entity.WareSkuEntity;
import com.bowen.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProdutFeignService produtFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    OrderFeignService orderFeignService;


    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //update wms_ware_sku set stock_locked= stock_locked-1 where sku_id = 1 and ware_id=2
        //库存解锁
        wareSkuDao.unLockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    /**
     * skuId
     * wareId
     *
     * @param params
     * @return
     */
    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断如果还没有这个库从记录，那便新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("ware_id", wareId).eq("sku_id", skuId));
        if (wareSkuEntities.size() == 0 || wareSkuEntities == null) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            //远程查询sku的名字 ,如果失败，整个事务不会回滚
            try {
                R info = produtFeignService.info(skuId);
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) skuInfo.get("skuName"));

                }
            } catch (Exception e) {

            }

            wareSkuDao.insert(wareSkuEntity);
        }
        wareSkuDao.addSrock(skuId, wareId, skuNum);

    }

    @Override
    public List<SkuHasStockVo> getSkusHastock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(sku -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(sku);
            vo.setSkuId(sku);
            vo.setHasStock(count == null ? false : count > 0);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;

    }

    /**
     * 默认只要是运行时异常都会回滚
     *
     * @param vo 库存解锁的场景
     *           1.下单成功，订单过期没有支付被系统自动取消，被用户手动取消。都要解锁库存
     *           <p>
     *           <p>
     *           2。下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1.按照下单的收货地址，找到就近仓库锁定库存

        //1.最简单的，找到每个商品在在那个仓库都有库存vo
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里都有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;

        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStock = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }

            //如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给mq
            //2.若锁定失败。前面保存的工作单就回滚了，发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //     1 - 2 - 1  2-1-2 3-1-1（x）
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStock = true;
                    //TODO 告诉mq库存锁定成功
//                    rabbitTemplate
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
                    detailEntity.setSkuId(skuId);
                    detailEntity.setSkuNum(hasStock.getNum());
                    detailEntity.setTaskId(taskEntity.getId());
                    detailEntity.setWareId(wareId);
                    detailEntity.setLockStatus(1);
                    orderTaskDetailService.save(detailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity, detailTo);
                    //只发id不行，防止回滚以后找不到数据
                    stockLockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                } else {
                    //当前仓库失败，重试下一个仓库
                    continue;
                }
            }
            if (skuStock == false) {
                throw new NoStockException(skuId);
            }
        }

        //3.肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {


        StockDetailTo detailTo = to.getDetailTo();
        Long detailId = detailTo.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        //有：证明库存锁定成功了
        //解锁：订单情况
        //1.没有这个订单。必须解锁
        //2.有这个订单。不是解锁库存
        // 订单状态： 已取消：解锁库存
        //           没取消： 不能解锁
        //没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity taskDetailEntity = orderTaskDetailService.getById(detailId);
        if (taskDetailEntity != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity byId = orderTaskService.getById(id);
            String orderSn = byId.getOrderSn();
            //根据订单号，查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单`已经被取消了。才能解锁库存
                    if (taskDetailEntity.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但是未解锁菜可以解锁
                        unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁。
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁
        }


    }

    /**
     * 解锁订单：防止订单服务卡顿，导致订单状态消息一只改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了
     * 导致卡顿的订单，永远不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
//        Long skuId, Long wareId, Integer num, Long taskDetailId
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}